It just materialised from stage left and landed on the lowest silver birch branch (Rambo's fave) which is very adjacent to the pyrawotsit which is everyone's safe haven. It sort of jumped onto the top of the pyra and then dropped down inside. I was sure Rambo (and possibly others) would be in there so I - yes, I know I shouldn't - went outside
. The sprawk immediately flew off >>>>>
15 mins later all the usual, including Rambo, were back.
Long time since I've seen a sprawk.